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Why is work considered to be the transfer of energy?

In physics we say that work is done on an object when you transfer energy to that object. If you put energy into an object, then you do work on that object (mass). If a first object is the agent that gives energy to a second object, then the first object does work on the second object. This is a transfer of energy.

Is energy used up?

Energy is often useful when it is transformed or transferred. This is often referred to as ‘using energy’, which is confusing because energy can’t be used up—it just gets converted to a different form of energy!

What kind of energy is speaking into a telephone?

electrical energy

How is energy transferred in a flashlight?

In a flashlight, the electrical energy becomes light energy and thermal energy in the bulb. 6 Light energy is transported by wave motion. In other words, light is a form of energy caused by electromagnetic waves. It enables us to see, as objects are only visible when they reflect light into our eyes.

Where and how is energy stored in a torch?

Cells (battery) are a source of energy for the torch. Chemical energy is stored in the battery which is changed into electrical energy and then light energy as the light glows. An electric circuit is a pathway that allows electricity to flow or a system that allows electrical energy to move.

What is energy transfer diagram?

An energy transfer diagram or a Sankey diagram is used to show the transfer of energy across a process or a device. It is a flow diagram in which the widths of the arrows show the relative amounts of each type of energy.

What energy is wasted in a washing machine?

A washing machine is a good example for a device that wastes energy. In this example 200J is supplied as electrical energy. Only 100J is useful energy in this case as half of it is transferred as sound and light that do nothing to your wash clothes.